TY - JOUR
T1 - Precise Exciton Management of Quaternary Emission Layers for Highly Stable Organic Light-Emitting Diodes Based on Thermally Activated Delayed Fluorescence
AU - Tanaka, Masaki
AU - Nagata, Ryo
AU - Nakanotani, Hajime
AU - Adachi, Chihaya
N1 - Funding Information:
This work was supported by the Program for Building Regional Innovation Ecosystems of the Ministry of Education, Culture, Sports, Science and Technology, and JSPS Core-to-Core Program (Japan). The authors thank Dr. Yoichi Tsuchiya, Keiko Kusuhara, and Nozomi Nakamura of Kyushu University for providing the chemicals for OLEDs. They also acknowledge Dr. Hiroshi Fujimoto, Dr. Hin-Wai Mo, and Kaori Nagayoshi from i-opera for their help with sample fabrication. 3
Publisher Copyright:
© 2020 ACS. All rights reserved.
PY - 2020/11/11
Y1 - 2020/11/11
N2 - Simultaneous achievement of both high electroluminescence efficiency and high operational stability in organic light-emitting diodes (OLEDs) is required for their use in various practical applications. Although OLEDs based on thermally activated delayed fluorescence-Assisted fluorescence (TAF) are considered to possess a promising device architecture to exploit the full potential of OLEDs, the operational stability of such systems still requires further improvement. In this study, a quaternary emission layer consisting of a combination of TAF and mixed-host systems is developed. OLEDs containing this emission layer show improved operational stability through the management of exciton generation processes while maintaining high electroluminescence efficiency. Furthermore, a gradient of the mixed ratio of the co-host matrix is used to optimize the recombination zone profile in the emission layer, leading to 17 times improvement of the operational lifetime compared with that of the corresponding single-host-based device. This research provides a simple and general method to develop highly stable TAF-OLEDs.
AB - Simultaneous achievement of both high electroluminescence efficiency and high operational stability in organic light-emitting diodes (OLEDs) is required for their use in various practical applications. Although OLEDs based on thermally activated delayed fluorescence-Assisted fluorescence (TAF) are considered to possess a promising device architecture to exploit the full potential of OLEDs, the operational stability of such systems still requires further improvement. In this study, a quaternary emission layer consisting of a combination of TAF and mixed-host systems is developed. OLEDs containing this emission layer show improved operational stability through the management of exciton generation processes while maintaining high electroluminescence efficiency. Furthermore, a gradient of the mixed ratio of the co-host matrix is used to optimize the recombination zone profile in the emission layer, leading to 17 times improvement of the operational lifetime compared with that of the corresponding single-host-based device. This research provides a simple and general method to develop highly stable TAF-OLEDs.
UR - http://www.scopus.com/inward/record.url?scp=85096079929&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85096079929&partnerID=8YFLogxK
U2 - 10.1021/acsami.0c15208
DO - 10.1021/acsami.0c15208
M3 - Article
C2 - 33099997
AN - SCOPUS:85096079929
SN - 1944-8244
VL - 12
SP - 50668
EP - 50674
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 45
ER -